[GHC] #15768: Using oneshot kqueue() on macOS

[GHC]

#15768: Using oneshot kqueue() on macOS
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        Reporter:  kazu-yamamoto     |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  highest           |            Milestone:  8.8.1
       Component:  Core Libraries    |              Version:  8.6.1
      Resolution:                    |             Keywords:  KQueue,
                                     |  oneshot, parallel build
Operating System:  MacOS X           |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by George):

 Ah ok, I was wondering why we didn't see this on Linux but the papers says
 we weren't using it there. We used epoll. From the paper: "The registerFd
 func- tion takes the callback table lock, and then inserts (or modifies)
 an entry in the callback table and registers the event subscription us-
 ing the underlying OS event notification mechanism, for example epoll [8]
 on Linux, kqueue [7] on BSD variants, and poll on other OSes"

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15768#comment:4>
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